Strain-insulator.



u. H. osoRNE.l STRAIN INSULATOR.

ATION FILED API l APPLIC 5. |916. 1,234,205. Patented July 24, 1917.

WITNESSES: INVENTOH n. 2H l l sr I 7a3 Arromlfns UNITED STATES PATENT oEEIoE.

DAVID H. OSBOBNE, 0F VICTOR. NEW YORK, ASSIGNOR T0 THE LOCKE INSULATOB MFG. C0., 0F VICTOR. NEW YORK, A CORPORATION 0F NEW YORK.

STRAIN-INSULATOR.

To all whom it may concern:

Be it known that I, Davia H. OsoRNE, of Victor, in the county of Ontario, and State of New York, have invented certain new and useful Improvenients in Strain-Insulators; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the aocompan ing drawings, forming a part of this specilication, and to the referencenumerals marked thereon.

My invention has for its object to improve the structure of strain insulators which are employed for supporting high tension conductors, and which embody generally an insulating portion or section of porcelain or other material arranged between and connected to a pair of metallic strain members, the parts referred to forming a unit which can be used singly or in series. In a more particular aspect the invention is designed to afford a. simple and effective method of connecting the insulating or porcelain seetion with a strain member, in a manner that permits the parts to possess thc strength and rigidity necessary for withstanding severe tension as well as lateral strains, and also to effectively obviate breaking or damaging the porcelain or other material from which the insulating section is constructed. Another purpose of my invention is to entirely climi nate the necessity of using a cement or similar binder for maintaining the strain inembers in fixed relation with the insulating section, thus entirely obviating the disadvantages resulting from different coeiiicients of expansion of thc metallic and insulating portions when these are tightly cemented together, and also eliminating the bad eifects of cement hydration which has been a serious disadvantage in this general type of insulator. To these and other ends the invention consists in certain in'iprovements and combinations of parts, all as will be hereinafter more fully described, thc novel :features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 isa sectional view of a strain insulator constructed in accordance with a preferred embodiment of my invention;

Fig. 2 is a horizontal sectional view on line 2*-2 of Fig. 1, and

Fig. 3 is a sectional view in a horizontal plane on line 3*-3 of Fig. 1.

Speciiication of Letters Patent.

Application tiled April 15, 19116.

Patented July 24, 1917.

Serial No. 91,275.

Similar reference numerals in the several figures indicate the same parts.

It it possible to carry out my invention in a variety of ways, and for purposes of illustration I have shown a raeticable embodiment in conjunction with a usual type of insulator construction, in which structure 1 designates the insulating section which is hollow and threaded interiorly, while 2 is the usual metal cap that is attached to the upper portion of the insulating section in any suitable manner, and comprises one of the strain members to be connected to a conductor. Arranged partially within the interior of the insulating section is a second strain member designated generally at 3 and embodying a flattened outer end portion 4 having an opening 5 by which it is operatively connected to a support, or another insulating unit. The strain memberB is provided with an enlargement or head at its inner end, having a beveled face 6 for a purpose that will appear presently, "and engages a suitable gasket 7 at its inner end. The strain member 3 is held in place Within the insulating section by a tubular retaining member in the form of an expansible device which embodies a plurality of independent and separable jaws, preferably of metal, designated at S. Each of said jaws 8 is segmental in form with its inner surface in cngagement with the strain member 3, while its outer surface is threaded for engagement with the threaded surface of the insulating section. Each of the jaws 8 is also provided with an inclined or beveled surface at its inner cnd to receive the aforementioned beveled face 6 of the strain member. In a.,- semblin the parts, the 'aws 8 are positioned about tie strain meln er in the position shown in Fig. 1, and while held in such relation the entire assemblage is turned into the threaded opening of the insulating section.

In the present embodiment there are two moral by engagement of its inner head or enlargement with the inclined surfaces of the jaws, the angle of which is such as to permit relative sliding of the head upon expansion and contraction, while the latter are retained in position within the insulatin section against accidental removal by Suita )le means, preferably in the form of a split washer 9, which is received in a recess 10 formed within the insulatin section. The washer 9 is resiliently held within said recess and extends beyond the interior surface of the insulating section far enough to engage the outer surfaces of the retaining jaws so that they are lprevented from turning with relation to t e insulating section, arid can only be removed after the washer 9 is taken out.

I claim as my invention:

1. In a strain insulator, the combination with la hollow insulating section, of a plurality of jaws which are exteriorly threaded for engagement with a threaded opening in the insulating section, and a strain member held by said jaws and cooperating to force them into engagement with the threaded Surface of the insulating section.

2. In a strain insulator, the combination with a hollow insulating section having a copie: of ons patent may be attained for threaded interior= of a plurality of jaws which are exteriorly threaded and form a tubular retaining member which may be screwed into the insulating section, a strain n'iember positioned within and held by the retaining member and acting to force the jaws into engagement with the insulating section, and means for preventing endwise movement of the jaws with reference t0 the insulating section` 3. In a strain insulator, the combination with a hollow insulating section having a threaded interior, of a plurality of jaws which are exteriorly threaded and form a tubular retaining member which may be screwed into the insulating section, a strain member positioned within the interior space formed by the jaws andv having a lie'ad or enlarged inner end which is beveled to engage correspondingly beveled portions on the jaws, and a removable device held by the insulating section and acting to prevent endwise movement of the jaws relatively to the insulating section.

DA Vl'l) H. SBORNI) lVitnesses:

M. Manicures MrLLnn, H. E. S'roivnnlzanna.

ve cents each, by addressing the "Commissioner of Yatents, Washington, D. D. 

